from datetime import timedelta

import uvicorn
from fastapi import Depends, FastAPI, HTTPException
from fastapi.security import OAuth2PasswordRequestForm
from starlette import status
from starlette.middleware.cors import CORSMiddleware

from constants import CLIENT_OPERATION_QUIT, EXIT_COMMANDS, SHEERKA_PORT
from core.Sheerka import Sheerka
from server.authentication import ACCESS_TOKEN_EXPIRE_MINUTES, User, authenticate_user, create_access_token, \
    fake_users_db, get_current_active_user

app = FastAPI()
origins = [
    "http://localhost:56426",
    "http://localhost:5173",
]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

#  NEED TO FIND A WAY TO INIT SHEERKA within the __name__ == "__main__" section
#  As of now, if we do that, sheerka is not properly initialized using the command
#  'uvicorn server.main:app' from the shell
sheerka = Sheerka()
sheerka.initialize()


@app.get("/")
async def root() -> str:
    """
    Root path. Simply display a welcome message
    :return:
    :rtype:
    """
    return "Welcome, my name is Sheerka."


@app.post("/token")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    user = authenticate_user(fake_users_db, form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )

    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(data={"sub": user.username}, expires_delta=access_token_expires)
    return {"first_name": user.firstname,
            "last_name": user.lastname,
            "access_token": access_token,
            "token_type": "bearer"}


@app.post("/echo/{message}", status_code=status.HTTP_200_OK, response_model=dict)
async def echo(message: str, current_user: User = Depends(get_current_active_user)) -> dict:
    """

    :param current_user:
    :type current_user:
    :param message:
    :type message:
    :return:
    :rtype:
    """
    if message in EXIT_COMMANDS:
        return {
            "status": True,
            "response": "Take care.",
            "command": CLIENT_OPERATION_QUIT
        }

    return {
        "status": True,
        "response": f"from {current_user.username}: {message}",
        "command": None,
    }


@app.post("/command/{message}", status_code=status.HTTP_200_OK, response_model=dict)
async def command(message: str, current_user: User = Depends(get_current_active_user)) -> dict:
    if message in EXIT_COMMANDS:
        return {
            "status": True,
            "response": "Take care.",
            "command": CLIENT_OPERATION_QUIT
        }
    res = sheerka.evaluate_user_input(message, current_user)
    return {
        "status": res[0].status,
        "response": res[0].value.body,
        "command": None
    }


if __name__ == "__main__":
    uvicorn.run("server.main:app", port=SHEERKA_PORT, log_level="info")